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Flapping Link in OSPF

Discussion in 'Networks' started by jovanis, Jan 24, 2009.

  1. jovanis

    jovanis Bit Poster

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    I have 4 routers in media-shared topology (R1,R2,R3,R4).
    I use OSPFv2 protocol (IPv4)

    "04:59:40: %OSPF-5 ADJCHG: Process 1, Nbr 10.2.0.1 on Fa0/1 FROM EXHANGE to FULL, Exchange Done"
    is repeated in R1,R2,R3.

    I use Packet Tracer 5, and when I use the timers throttle spf spf-start spf-hold spf-max-wait command (R4(config-router)# timers throttle spf 5 20000 20000)**, OSI finds an error ( Invalid input detected at '^' marker.) in "timers".


    I have 2 queries:

    1. Does Packet Tracer support that command and if it supports it, what is the mistake?

    2. Do I need to apply this command on every router?

    ** I used this command on every router with the same results.

    Thank you.
     
  2. r.h.lee

    r.h.lee Gigabyte Poster

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    jovanis,

    Can you describe the physical topology between R1, R2, R3, and R4?
     
    Certifications: MCSE, MCP+I, MCP, CCNA, A+
    WIP: CCDA
  3. jovanis

    jovanis Bit Poster

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  4. Spice_Weasel

    Spice_Weasel Kilobyte Poster

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    I don't know if packet tracer supports the command, but you syntax is correct. For the flapping link error, can you give more information? Is it a specific route that is flapping, or an adjacency?

    Spice_Weasel
     
    Certifications: CCNA, CCNP, CCIP, JNCIA-ER, JNCIS-ER,MCP
    WIP: CCIE
  5. r.h.lee

    r.h.lee Gigabyte Poster

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    jovanis,

    Is this a Packet Tracer "Troubleshooting" Activity?
     
    Certifications: MCSE, MCP+I, MCP, CCNA, A+
    WIP: CCDA
  6. jovanis

    jovanis Bit Poster

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    No it isn't. I just wanted to work out with different scenarios and i faced that problem. I can give you the original file in order to check what is going on.

    However, i am afraid that the routers, i used(1841), dont support the timers throttle spf command, so
    I will try the same topology with different routers propably tonight.

    Do you have any other idea about that problem?
     
  7. r.h.lee

    r.h.lee Gigabyte Poster

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    jovanis,

    How did you determine that a link is flapping? Which router(s) have what output indicating a flapping link?
     
    Certifications: MCSE, MCP+I, MCP, CCNA, A+
    WIP: CCDA
  8. jovanis

    jovanis Bit Poster

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    Sorry for the delay.

    R1, R2, R3 display "04:59:40: %OSPF-5 ADJCHG: Process 1, Nbr 10.2.0.1 on Fa0/1 FROM EXHANGE to FULL, Exchange Done" and R4 doesn't "see" any OSPF route in its route table. I consider it as flapping on R4 (plz correct me if I am wrong).

    When I disconnect R4 from the network, R1,R2,R3 function perfectly, but when I reconnect it, the problem starts again.

    All of the routers are 1841.

    I would like to thank you for your support.
     
  9. r.h.lee

    r.h.lee Gigabyte Poster

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    jovanis,

    What is the requirement(s) for two OSPF routers to form an adjacency?
     
    Certifications: MCSE, MCP+I, MCP, CCNA, A+
    WIP: CCDA

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